mdw@git.distorted.org.uk Git - fwd/blob - acl.h

   1 /* -*-c-*-
   2  *
   3  * $Id: acl.h,v 1.3 1999/07/27 18:30:53 mdw Exp $
   4  *
   5  * Access control list handling
   6  *
   7  * (c) 1999 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of the `fw' port forwarder.
  13  *
  14  * `fw' is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * `fw' is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with `fw'; if not, write to the Free Software Foundation,
  26  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: acl.h,v $
  32  * Revision 1.3  1999/07/27 18:30:53  mdw
  33  * Various minor portability fixes.
  34  *
  35  * Revision 1.2  1999/07/26 23:28:16  mdw
  36  * Minor modifications for new design.
  37  *
  38  * Revision 1.1.1.1  1999/07/01 08:56:23  mdw
  39  * Initial revision.
  40  *
  41  */
  42
  43 #ifndef ACL_H
  44 #define ACL_H
  45
  46 #ifdef __cplusplus
  47   extern "C" {
  48 #endif
  49
  50 /*----- Header files ------------------------------------------------------*/
  51
  52 #include <stdio.h>
  53
  54 #include <sys/types.h>
  55 #include <sys/socket.h>
  56 #include <netinet/in.h>
  57
  58 /*----- Data structures ---------------------------------------------------*/
  59
  60 /* --- An access control entry --- */
  61
  62 typedef struct acl_entry {
  63   struct acl_entry *next;               /* Next entry in the list */
  64   unsigned act;                         /* What to do with matching hosts */
  65   struct in_addr addr, mask;            /* Address and netmask */
  66 } acl_entry;
  67
  68 #define ACL_DENY 0                      /* Deny access to matching hosts */
  69 #define ACL_ALLOW 1                     /* Allow access to matching hosts */
  70 #define ACL_PERM 1u                     /* Bit mask for permission bit */
  71
  72 /*----- Functions provided ------------------------------------------------*/
  73
  74 /* --- @acl_check@ --- *
  75  *
  76  * Arguments:   @acl_entry *a@ = pointer to ACL to check against
  77  *              @struct in_addr addr@ = address to check
  78  *
  79  * Returns:     Nonzero if allowed.
  80  *
  81  * Use:         Checks an address against an ACL.
  82  */
  83
  84 extern int acl_check(acl_entry */*a*/, struct in_addr /*addr*/);
  85
  86 /* --- @acl_dump@ --- *
  87  *
  88  * Arguments:   @acl_entry *a@ = pointer to ACL to dump
  89  *              @FILE *fp@ = pointer to stream to dump on
  90  *
  91  * Returns:     ---
  92  *
  93  * Use:         Dumps an access control list to an output stream.
  94  */
  95
  96 extern void acl_dump(acl_entry */*a*/, FILE */*fp*/);
  97
  98 /* --- @acl_free@ --- *
  99  *
 100  * Arguments:   @acl_entry *a@ = pointer to a list of ACLs
 101  *
 102  * Returns:     ---
 103  *
 104  * Use:         Frees all of the memory used by an ACL.
 105  */
 106
 107 extern void acl_free(acl_entry */*a*/);
 108
 109 /* --- @acl_add@ --- *
 110  *
 111  * Arguments:   @acl_entry ***a@ = address of pointer to list tail
 112  *              @unsigned act@ = what to do with matching addresses
 113  *              @struct in_addr addr, mask@ = address and mask to match
 114  *
 115  * Returns:     ---
 116  *
 117  * Use:         Adds an entry to the end of an access control list.
 118  */
 119
 120 extern void acl_add(acl_entry ***/*a*/, unsigned /*act*/,
 121                     struct in_addr /*addr*/, struct in_addr /*mask*/);
 122
 123 /*----- That's all, folks -------------------------------------------------*/
 124
 125 #ifdef __cplusplus
 126   }
 127 #endif
 128
 129 #endif